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Viagra is supplied as blue, film-coated, rounded-diamond-shaped tablets containing sildenafil citrate equivalent to 25 mg, 50 mg, or 100 mg of sildenafil. Tablets are debossed with PFIZER on one side and VGR25, VGR50 or VGR100 on the other to indicate the dosage strengths. drug side effects and interactions 0173-0831-13 Do not take Cialis more than one time each day.

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This is not a complete list of all possible side effects. Others may occur in some people and there may be side effects not yet known. cialis men have liver problems upper abdominal or stomach painSeek emergency medical attention or call the Poison Help line at 1-800-222-1222.If you take too much (overdose)

1 NDC:0173-0828-13 30 TABLET, FILM COATED in 1 BOTTLE, PLASTICCytochrome P450 Inducers — Studies have shown that drugs that induce CYP3A4 can decrease tadalafil exposure. how to take cialis 20mg Levitra demonstrated a clinically meaningful and statistically significant increase in the overall per-patient rate of maintenance of erection to successful intercourse (SEP3) (37% on 10 mg, 34% on 20 mg Levitra compared to 10% on placebo; p<0.0001).

Penile erection is a hemodynamic process initiated by the relaxation of smooth muscle in the corpus cavernosum and its associated arterioles. During sexual stimulation, nitric oxide is released from nerve endings and endothelial cells in the corpus cavernosum. Nitric oxide activates the enzyme guanylate cyclase resulting in increased synthesis of cyclic guanosine monophosphate (cGMP) in the smooth muscle cells of the corpus cavernosum. The cGMP in turn triggers smooth muscle relaxation, allowing increased blood flow into the penis, resulting in erection. The tissue concentration of cGMP is regulated by both the rates of synthesis and degradation via phosphodiesterases (PDEs). The most abundant PDE in the human corpus cavernosum is the cGMP-specific phosphodiesterase type 5 (PDE5); therefore, the inhibition of PDE5 enhances erectile function by increasing the amount of cGMP. Because sexual stimulation is required to initiate the local release of nitric oxide, the inhibition of PDE5 has no effect in the absence of sexual stimulation. myocardial infarction within the last 90 days

Esta lista no menciona todos los efectos secundarios y puede ser que ocurran otros. Llame a su médico para consejos médicos relacionados a efectos secundarios. Usted puede reportar efectos secundarios llamando al FDA al 1-800-FDA-1088. online drugstore PDE-5 inhibitors are generally well tolerated. Side effects include headache, flushing, dyspepsia, and nasal congestion.Tranced (taken for less than 1 month) September 30, 2015blood vessel problems

If you do not understand the instructions on the pack, ask your doctor or pharmacist for help.Hepatic ImpairmentThe neurotransmitters which are released in the penis cause another chemical to be made, called cyclic guanosine monophosphate (cGMP). This chemical causes the arteries in the penis to widen (dilate). This allows extra blood to flood into the penis. The rapid inflow of blood causes the penis to swell into an erection. The swollen inner part of the penis also presses on the veins nearer to the skin surface of the penis. These veins normally drain the penis of blood. So, the flow of blood out of the penis is also restricted, which enhances the erection.

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